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How to choose new master from slaves.?

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Hi All,

 

I have a very basic question about streaming replication feature of Postgres.

Let’s assume I have servers A, B, C, D, & E with postgres installed with streaming replication as follow:

à  B ( sync replication )

A  à  C ( async replication )

A  à  D ( async replication )

A  à  E ( async replication )

A is master & rest are slaves.

 

Now my question is:

Assume replication link between A & B may/may not stable.  If A goes down, how will I choose my new master from slaves? What are criteria to choose new master?

 

Thanks,

Sacheen Birhade

 


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